I use the M4 displacement maps all the time, with the above mentioned script to load them. I've also taken that script and edited it to load other displacement maps (such as Smay's last gladiator, or StudioArtVartanian's various displacement maps that come with her characters).

Not adjusting the gamma on them does result in some horrific results: M4 will look like a zombie.

But if you just use the material mod script that comes with Poser to adjust gamma on displacement maps to 1, it's fixed in a couple of clicks (though for reasons I don't understand, I sometimes have to run the script twice to get it to work).

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PoserPro 2014, PS CS5.5 Ext, Nikon D300. Win 8, i7-4770 @ 3.4 GHz, AMD Radeon 8570, 12 GB RAM.